Lol why would you ever not go for Umbrella after 214B+G, especially near a wall...not worth to go for a mixup in exchange for so much damage. Going for Mixups is good on wall combos when the damage scale really affects...so you can reset it....
My secret: To end an important match in tournament, use 44KB. Im serious, nobody knows this move since its such a shit. Its so bad its funny. Setsuka has such a little moveset, people will eat this 9 out of 10 since they have never seen this move in their lifes. This move is almost like a secret move...Malek laughed so hard when i used it against him a month ago, even he didnt know this shit of a move.
Another "secret" move is 33K. It kills step and has a shit auto GI in it which is good for nothing. On ch it gives free Umbrella or 44B+K, on Block it has MASSIVE pushback, its super to just jump back into 33B, o jump back Umbrella etc...the 66K version of it looks exactly the same but doesnt give the free 44B+K on ch.
66A+B also has a tech trap into B+K btw.
And against X, you can go for delayed aB slide when she techs against A+G throw. This way you will make her stay otg more often to really use A+KB followup. Amy can escape both afair. She is a whore in the end, so it makes sense.
What i also like is 44BA mixups when they GI the second hit. 44B~JF Umbrella will hit them etc,
6AA is really really nice as a frame trap. I hit people so much with 6A~ch 6K. Try it.
ch WSB into Umbrella is actually a combo. But its super hard to do,
When you hit 1B:B or ch 33B near a RO, 66BA will RO them way easier than Umbrella. We really need to use that instead of always doing umbrella. The range it ROs is really good, no risk to mess up etc. Think we somehow forgot this.
Those arent sectrets, but some tips. Setsuka has no secrets afaik.